HOUSTON -- The Minnesota Vikings may keep the Jacksonville Jaguars guessing about Adrian Peterson's status all the way up until inactives are due 90 minutes before the season's opening kickoff.

Vikings coach Leslie Frazier said on Thursday night that Peterson will "probably be a game-time decision" on Sept. 9 as the team continues to evaluate his recovery from left knee reconstruction.

"We've got a lot of things we want to get done with him this week," Frazier said. "I doubt that we would know without getting him through an entire week if we thought he were ready to play in a football game. We need to take him through some more things this week."

Peterson tore the anterior cruciate ligament and medial collateral ligament in the knee on Dec. 24 at Washington and had surgery six days later. He and the team have said repeatedly the goal was to have him ready for the opener, but the Vikings have proceeded with caution.

They activated Peterson from the active/physically unable to perform list on Aug. 12 but decided to hold him out of the preseason and only let him take contact for the first time on Monday.

Practice resumes on Monday at Winter Park. Players are off on Tuesday, meaning Peterson has four practices to prove to coaches he's ready for a game situation.

Of course, Peterson has made the most of a game-time decision before.

On Dec. 5, 2010, Peterson's pregame workout convinced Frazier his sprained ankle was in good enough shape to play against Buffalo. That day, he rushed for 107 yards and three touchdowns in a 38-14 win.

"We would both like to see that," Frazier said. "We would like to see something similar for sure. It'd be good for our team and our fans."